531388 has 24 divisors (see below), whose sum is σ = 1093680. Its totient is φ = 222720.

The previous prime is 531383. The next prime is 531457. The reversal of 531388 is 883135.

531388 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a hoax number, since the sum of its digits (28) coincides with the sum of the digits of its distinct prime factors.

It is a nialpdrome in base 9.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (531383) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 108 + ... + 1036.

It is an arithmetic number, because the mean of its divisors is an integer number (45570).

531388 is a Friedman number, since it can be written as 81*3^8-53, using all its digits and the basic arithmetic operations.

2⁵³¹³⁸⁸ is an apocalyptic number.

It is an amenable number.

531388 is an abundant number, since it is smaller than the sum of its proper divisors (562292).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

531388 is a wasteful number, since it uses less digits than its factorization.

531388 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 957 (or 955 counting only the distinct ones).

The product of its digits is 2880, while the sum is 28.

The square root of 531388 is about 728.9636479277. The cubic root of 531388 is about 80.9973072315.

It can be divided in two parts, 53138 and 8, that multiplied together give a square (425104 = 652²).

The spelling of 531388 in words is "five hundred thirty-one thousand, three hundred eighty-eight".